Robert M. "Mike" Duncan (born 1951) was the chairman of the Republican National Committee. He was elected in January 2007, replacing Ken Mehlman, and served until January 30, 2009, when he withdrew from renomination to the chairmanship. He became the chairman of the board of directors of the Tennessee Valley Authority effective May 18, 2009. Duncan stepped down as TVA chairman in May 2010 to become the founding chairman of American Crossroads, a 527 Super PAC organization.
Bio from Wikipedia - See more on en.wikipedia.org Text under CC-BY-SA license